You use the Oral-B electric toothbrushes for sensitive teeth for sensitive teeth or gums. With this setting, the brush brushes at a lower speed. This way, you can clean your teeth in a soft and comfortable way. With the pressure sensor, you also make sure you don't press too hard when you're brushing. The Oral-B iO 4 up to 10, the Genius, and the Pro models have a setting for sensitive teeth.